Unix Timestamp Converter - Epoch Time to Date Online
Convert Unix timestamps to human-readable dates and dates to epoch time. Supports milliseconds, timezone conversion, and batch processing.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (also known as Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It's a universal way to represent time that is independent of time zones and is widely used in programming, databases, and APIs.
What's the difference between seconds and milliseconds?
Unix timestamps in seconds are 10 digits (e.g., 1738498245), while milliseconds are 13 digits (e.g., 1738498245123). JavaScript's Date.now() returns milliseconds, while many server-side languages use seconds. This tool auto-detects the unit based on the number of digits.
What is the Y2K38 problem?
The Year 2038 problem (Y2K38) occurs when 32-bit signed integers overflow on January 19, 2038 at 03:14:07 UTC. At this moment, the timestamp 2147483647 will wrap to -2147483648, potentially causing software failures. Modern 64-bit systems are not affected.
Can timestamps be negative?
Yes. Negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969. This tool supports negative timestamps for historical date conversions.
Is this tool secure?
Yes. All conversions happen 100% in your browser using JavaScript's native Date object. No data is ever sent to any server. You can verify this by checking the network tab in your browser's developer tools.
Code Examples
// Get current timestamp (seconds)
const seconds = Math.floor(Date.now() / 1000);
// Get current timestamp (milliseconds)
const ms = Date.now();
// Timestamp to Date
const date = new Date(seconds * 1000);
console.log(date.toISOString());
// Date to Timestamp
const timestamp = Math.floor(date.getTime() / 1000);